Loading...
Please wait, while we are loading the content...
Similar Documents
Numerical simulation of the sofia flowfield
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Klotz, Stephen P. |
| Copyright Year | 1994 |
| Description | This report provides a concise summary of the contribution of computational fluid dynamics (CFD) to the SOFIA (Stratospheric Observatory for Infrared Astronomy) project at NASA Ames and presents results obtained from closed- and open-cavity SOFIA simulations. The aircraft platform is a Boeing 747SP and these are the first SOFIA simulations run with the aircraft empennage included in the geometry database. In the open-cavity run the telescope is mounted behind the wings. Results suggest that the cavity markedly influences the mean pressure distribution on empennage surfaces and that 110-140 decibel (db) sound pressure levels are typical in the cavity and on the horizontal and vertical stabilizers. A strong source of sound was found to exist on the rim of the open telescope cavity. The presence of this source suggests that additional design work needs to be performed in order to minimize the sound emanating from that location. A fluid dynamic analysis of the engine plumes is also contained in this report. The analysis was part of an effort to quantify the degradation of telescope performance resulting from the proximity of the port engine exhaust plumes to the open telescope bay. |
| File Size | 2136277 |
| Page Count | 76 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950008198 |
| Archival Resource Key | ark:/13960/t3fz26n6z |
| Language | English |
| Publisher Date | 1994-07-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Tail Assemblies Boeing 747 Aircraft Wings Computational Fluid Dynamics Stabilizers Fluid Dynamics Sofia Airborne Observatory Flow Distribution Pressure Distribution Computerized Simulation Aeroacoustics Sound Pressure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
